Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b99fdb0e908b47a1601bce5215c87ef6d41a5e1d87594f2adf68b65bcb93b6a' 
  AND token = 'fF9h2S4DSI+FtLZ/Q1BYXLRbMKRe0yJjToIxCn8rkgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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