Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15121232602fe156f954b95b539863d97f68628b233550c2b6ea8b057f2cefd1' 
  AND token = 'AS4wkw1EKzDwpvopbyz36T3NIyCEFYgDg1Wo7LX5Z48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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