Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dbe49b3a6fb1694f7c9645baa3f0bf6bd13eddf75c35c4ab307bc4fb56b581' 
  AND token = '+QJqVGOHhvrwBy/3u+Muuoo7GVeAu6qUVc33rXSGJ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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