SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0ceae280e384c37c930e6b8874c58d492d6932891b0a5f1e4691f45c5449727' 
  AND token = 'vMuVfq0wx+GwSKE5nA+Wrjja6EwmNYH5EnUWqmudzkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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