Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8fe429dc60cc373da10495c56c5d1d2e431c700218f7de480fba0710a377a3' 
  AND token = '9FFCn+xntXnUYO3e7cjQ7fx9rVfvFrf/XiUEqdLB+Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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