Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd6c8a680e67747199fa55ccadcdff12cc2fc84b1aaa71589b346b0c778c174' 
  AND token = 'A0TIDbuLk07bPH6XFDpTtv1g5C3cyRyK+DqBk/jM7dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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