Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1cd8e05c9c9f8951c1e8d12daded1377aa97a97bfa2813e1d547ea5fbbe72a' 
  AND token = 'F4MRwuYY6SvUQzL/3N59znf2LOrbk3ES8HtbkGO0IS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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