SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '001d59618cb1ea92d2afa61f8f09e90e6b35f153f99b7f2c9765a08d441f7af0' 
  AND token = 'Erbt4h1kl/OA9IqEVebFGcUB+OBoYXpVBI6qM6+sMfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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