Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9b2cd28335083a3cc80a8b2a97c94f72c15ab7353b57fa620481e03add42b4' 
  AND token = '2bH2WqNapZIhzCP98O1B0qfIPrblQcF2YRLUTMoO9zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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