Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d893ff7148c5f93dc204f703cd90b1ce1c30d2652e5f8d8404fb168658ce81' 
  AND token = '2qOqaBaChLtbDQMvP+GTnI4Ec30v8IqMHD8Ve8SecBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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