Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f8cc31bed13b584c7753edcdb8351ae7b9ee4f9a9cee1dfc8cc5a224033a7' 
  AND token = 'GWIvvHvzJ9EaknxYec9id0CFGTmIwrkaFnFThj7Zrcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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