Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634f4552dbb2f562551a74992b933f96626f5e582191aab9c179481e881fbda' 
  AND token = '9b1vduqrsIb7+w8lzzy4E/AK/VgdStH2HJrRJK9ur4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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