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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69fc026ef299cf7e89da34f9c97a928345b43a07bd0f00646466bd37b869a1b8' 
  AND token = 'IPIA4eYOkY3vSCavUM7eN0g9NibLJkFRDvGyMd2b4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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