Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820658905d895749935aee2895a8edfd87840a909f7910c60023f76e3b2a69fb' 
  AND token = 'DxkRcQGZ0c96ejvzmpcfuGJpKvSpCYWVOhIN9E6iPpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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