Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c689aa0fd6ae99f1a8a28b6fd47df637d5d04d928136544e98b84b28dae28942' 
  AND token = 'cBRwrFxlAy5+okD8ZYNjONWrsRXEl9lOgpiRQ2s87gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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