Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e35b8e094557d8b993db32db274cd9db01f5fb57ec871621c10f98ae356159c' 
  AND token = '0Xqafh9Qzb57vpL+sFoHBut8WMAbUmW1DnUfBXhzpJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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