SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98e5c798c096e7d613cc365a070fa24f8622517e3f23ab5a3c8c413672f8a5d0' 
  AND token = 'YRatMLHyG/wWH9UPwsAkQMx4uCNzs0hOZ+5p5KhFxdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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