Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368e01b2315ef10d9e3072e24f5a551e1ce098bcdaf99a2ee9a8fe83cd9eff43' 
  AND token = 'sZcPcEH/DioKfYV8UmqTfYAy5eVM6WLNO+/k750SNQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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