Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1dc3f4caade21c7f50f159179ace0ea77f6030b0073c88b122e4a92c00e521' 
  AND token = 's6koH9/T6ugABBJfRTC5jxqMccpAYycR/3WV1/IHil0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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