Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3f54a43adeb6e7ca0d8d85cf6e5baed6aa862d4acb04f4b9c59ba19097aaff' 
  AND token = 'GpDxyVokTpJLtGkfGZS9RcXb9tyjLcDA7joH2XnSJuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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