Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677c8c5d223763860be6ef1712ed5aae9b422965eaa4355c33f102f602ba410c' 
  AND token = 'K8Nxf23kA8RV7Iyvnl6z25rydLYvQg8yzjePHbhCplI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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