Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914d7358f8caad6cc8ecfe8e44c1230acb8df864fe609d0b5ecdc5a6143a1f9a' 
  AND token = 'h5Gl268ekqpser+ydU8y2mFHYc/o7bZ7EOUG4pWOmvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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