Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a10a5f7caee5d8eb7210398471a4996e58795f889b50f17987cf82e723f45dc' 
  AND token = '2WD1henwJRrf43u+ukcvLEjXvg5XkRzlCVAppmyeuDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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