Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8721402ed7f5d152f024cb6b0eb1d46a13d9a7efe9fe0a7a85b91e00f55f81a0' 
  AND token = '2gJ6FZrLtxbyV+n5Ti0ZIuo78LUM2nXt00rDB4tOKoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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