Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d12cb4268e68c92949b635929043f341e9f75b41c516a207c8d3f9c22d8569' 
  AND token = 'WMVBepbtop6cNyLA9VgOkgBj4OdCUnOZewTPkS0sT74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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