Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4290d9d9ebda4ee6837c34da6325d99a4e3e659f5ab6f6c920ce1c4e14b65ac3' 
  AND token = 'wUXEGu6pHAvNxWs7/81BVOd6N7oF7/IPEQLBJBDQQAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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