Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308c71208d4851e4b1b5162befedef265097f3e7d349ae64c64e6fb2f7f4a855' 
  AND token = '3HIypASKA6HaGAxpcQIvyFqjffFVqqjCrcfOp6RH8aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}