Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2e368ecbea7a7ca408f1b9eaa817a83596bdb1bdbff591f68b727c83f14915' 
  AND token = 'x5/yjS0m5qb+aiFjT9Z3v1eX/eqc2OcN8Ro/oNM/m3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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