Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b81cc7d3eabb073849b8073f6d9c0849a62e5dfce7ba4ad9d7c22c522365236' 
  AND token = 'blPKpttNwIsLZVYhAVsL9ZpF9W0aP7Q7qQym8ReEOos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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