Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735ab3b8390f2316420a47409d3b199afe36493ad079d6538479da7347651a65' 
  AND token = 'NELn1WFpZ21ntTSLr3AMXpgbBnhCfWaTVk24HBuNYpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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