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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ace85a55b8a5a8f689797ed717529c3ef8f4b1a91d26df5fafb6deee5a3775a' 
  AND token = '1Bs+BF/U97KH03sHiqIfiMZxNteS+vUndGmigZPjepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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