Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50408e15f6742df4d824149855b8c3c447111789070b32bd7b307dc690718bc0' 
  AND token = 'fvQqqZ/xttfH8UghDuhHfzv7MRbgRTOxWZhsNmtUwv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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