SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d226823d1c464b3709d11e8fd012db05ce75f8642e6bbd5037847d8c4d00a0e' 
  AND token = 'F98xaipBSEjOOrMyw2xmWl/xQzHALspkfUqHJKSyUPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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