Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0cf8cee0f79597fcc23ce52299c6f85269cad50f42bcbc53672a093383cc6c' 
  AND token = 'UdeNfIKjBZir/gc6kjYRMxXKOH8qpOzXc1VSM1nZdhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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