Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4cbb7e0e9286b74c0c0a76bd5b48e1de6081f5d22665ef557661f5bf8c9491' 
  AND token = '/Xm6qCN2grwrpAi4KXtsOHIF2rICnooyhO7a+sg436Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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