SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1bb8eff21a728fdee96e2740b7d3d93b2b0639488271d085eefbcd524e0ea291' 
  AND token = 'ROXdZUuVdXKhRGu9BaEOaKpG/zT4XPM6TvZnm2IYxqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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