Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271b782dcf91a5a59b5cd65a57ef988046e083ffdaa09c6d4495aa2248ecd7e1' 
  AND token = 'ZCJbD+GiMJYRwC/eZElDcv1odp8JRAcFVW1QPfEznQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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