Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'def7f0de6d1a75a674ee9eb1fb8ee2749e5382fb9143f9d2535931db9359ae5a' 
  AND token = 'olpi9ZYHQViZGREMbM43dpQu1/DLJtTEaipCxxbxdYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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