Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ef41088cfb1cd1a2ad6881b7c87e7bb21af07c4a6a371dd8c57d82c7f037f6' 
  AND token = 'K52yQZ9iOMblbCFFDPlKUL4Vx6NnejpZXb2NJgaJdcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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