SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df64cbb590a7ad5e9f8b6fe916415f1585950fa9cb3cba22b7b9174030c2d927' 
  AND token = 'qpVeXhu1KPFsQhT2A2TBE58gLXAtH5kOykZKkxqgEuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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