Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a16c68072529a67cc4ead7c6b1985b59287041d8af786569c3257f9dbf51bf' 
  AND token = '5QhD6QuAP6lhhyfj9Vyg/ydrwTrgtqXx3y36wdfN89E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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