Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38376f8a88fb215bc396a6c1f8b30b948b0d045abebfe7d6d24b9303fb25d517' 
  AND token = 'RhbgL0cKJAzbKQLzw92NMPVdu5mDncvocxUh7C8dyGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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