Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5bbbcbafbebdc2cf3182fd95407da02d648e2483be6034b451e52da843480d' 
  AND token = 'wJmnfGZiYaR7ihE73wy0uzRbtf40KIp9/48x3nUxRSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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