SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '986581c8f78c4dc4942d4c5b1438539fc97b23af20060b64b7bd0be5c1a5755e' 
  AND token = 'bQm/IhNHQoN/YlBSMVeGYEtzqo5m2PLGHZI4lgDXw0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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