If you bought the game in 2022, you likely don't get a key, since the game was not even released to steam yet during that time.
The early access to steam version happend during this year 2025, so you probably would have to buy it on Steam now to get it since you no longer validated to get a steam key because you bought it before it was released to Steam.
But if you have not yet bought the game on Itch, you can get the Steam key from the Sapphire Safari Steam Key purchase you can see further up from the main page of this game's site.
Looking a bit further into the purchase of it, it seems there is only a choice of buying the Itch version or the Steam key, since it shows in the description: Sapphire Safari but only the Steam key!
So in other words, you dont get a Steam key when buying the itch version. You just able to buy a Steam key because some has issues buying it on steam.
Viewing post in Sapphire Safari (Beta Access) comments
No worries, i just wondered as i had bought it back in 2022 during that time you could only by it as a bundle with another game! as the bundle costed just a tad more then the game and it wasnt yet to be announced to steam! but i guess its wait for a sale time ahah! thank you btw for the response keep up the good work