Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a15167aa66f05b4ad6e1c9209cd2ee7a708e5a47483583b0280b0b54e8e1e9f' 
  AND token = '3rokkXZmTP7K1w45TRcBlGeEJKavwQ0tb0gjz7aHlc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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