SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3dbdfcf73b3d660a3e28ca907c0a6d33619d40692ed558358d53123fd298b935' 
  AND token = 'TvuzvC8wZ20zOXRoAS/P2KcvgIKYqUlDdM+3rjtA97E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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