Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8546dfcd6bd4dff89b6636a55cf6768fab744787ae6289ec6e72e8267f7b4b2a' 
  AND token = '8OjpMPG/ul/UyvpExO0nLAiWmCEGGFWtPrtAE68YIHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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