Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8ceac532d459f918685f8bae799b8faad7495c83a7f2253678136e72a9966b' 
  AND token = 'm68SYL52xVHcGY540fxmUzBHLIN9ndhPJbVBEZMxc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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