Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd968cc6309917bd38496aa1cae275e0cfba47a79b6bad44249bc17b3b980eb1c' 
  AND token = 'i5OwiGK9Fd8CFnYq/t45g+I7DUMfx0thBGu0ICJQOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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