Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b773edea8b8d0b66c72ccacba7a2f793dcc28ee4be5efbd391d56c5b9415ac8' 
  AND token = 'ZtOLIXhWxq5e5E3p+vcRkOHrZe24bK+EIU1eJqLybAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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