Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83b61c503f530615412a33fc99ba5613b502f08ddb5ff45d2e9aa1c5740638f' 
  AND token = 'Yv1l38/bafZ2cViS7dCbz/MtZvoDUOUDWY1FdD0zVaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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