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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e55c7ed0082197292621769b7194f1e2695df1d935e67c952a26562f7ace44e' 
  AND token = 'N8pTcH7GKAT/G9kzPS29FySi3hlmuiUzPrf5FssvBKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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