Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4d840dd137ea5c775a3be26ce3baf7c5e7c5fc1587e4ad340239584cfe286a' 
  AND token = 'v1tgHfCoG8Ih18TZ9XtSzlohidoR6SnQVlfUxo7d3gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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