Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b043be2212043689387cc594e5810025c48d93cc542ce681a7920734b4d64d56' 
  AND token = 'xS+sxAyytq7fpvKRgNspHOasPkD/LU4qsQxvLr5ncOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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