You can. Usually it's an "exp" value that you set when the token is issued. The time can be whatever you want, I might do something like now + 15 minutes. Then

You can. Usually it's an "exp" value that you set when the token is issued. The time can be whatever you want, I might do something like now + 15 minutes. Then when verifying the token you can check if exp <= now kick out a 401 response.