Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea69261d475c9167234740378e85dad4136128a63e5b2cbeb77ab56723b4f921' 
  AND token = 'Uwo7dR4cTS1S3GmVxdg7Qvhv7QqzDRr9sr+KJ4Pxzto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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