Uhm. Huh? How so? Do you plan on giving the same key to different people? There is an option for that, I believe it is used for promotion, to give out games to testers or some such.
https://itch.io/docs/creators/download-keys
A download key’s URL is unique and should not be shared. If a download key is linked to an account then it can only be viewed by the owner when they are logged into their account.
There is written more info on that page. But claiming is only mentioned for 100% off sales, where you can deactivate claiming.
Edit: Maybe it means that the key you give out can be put into an account. Which would be bad, if you want to give that key to multiple people.