Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9623240fac8ec686e3b7a7007026620fbce2f487a029c2845f31824805c0e642' 
  AND token = 't+7WCc0CGAOx9McG2J9i30VNYtpt8OBMj/u1aeRGHRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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