Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9b5724267d74d939e29efcfb54ea4fc104c16d64851389712a384b0f0daeb2f' 
  AND token = '9PnVyeAAQesjtR/PqC3+aWDUrP/jUoAe9ITkox7fADU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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