Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '403995379ffd8da467185ff52ae98a66b7b83157e9710df677390c35e946f8a8' 
  AND token = 'K4yAEldxdMPmYWdb9P32lwAYr1zAS38qQcXbpVLH8tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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