Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e126a92d9dc96b817a777627b13d8c980c2765bacacf029082d6b1b64c7d4834' 
  AND token = 'szhFl3YLqrfQ4kuZPOL3lKs9Cg0zBBAJ6ylrB0eY5Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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