Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c7b9ad1c20774ac8db500b05a3c34a5095f507c160a2d331ae0640558f95d5' 
  AND token = 'P3jlRn2LjIiZy1ws1ccmt5wVU5GZArFnQpDK8eXwwu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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