Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef023732218f44f2855703b438508e533ce382bc332b2b5187b0430533d364bc' 
  AND token = 'fH1oPYd2bT8KeT89t+gJOkiDzdZCMqLSgz0f7xLl9RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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