Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbedcbc8bd94cc1d8c3fedf9c7f9d3829dea2154378d8d8672a7b4b5cb121f01' 
  AND token = '3cx0874E4gNGtlNAQ/FB62zO7KkFVfyCQy6ktiMg9Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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