Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2754f98d85d9722a49a7c16d4d3574e552b3ba296e925bbfb613c2e78670ab48' 
  AND token = 'OOw+29p6ug/EZuMAqEFtN5kuNOLBqcscz03wOobgN9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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