Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356eaa05b0a28de7a486d8fdd13f8074ae3d4308ed7a8b5d254249ddb47d5033' 
  AND token = 'SQWVriWjZn5ISrsocG0CXz9T6DIrQfTYoQZR1uOdkls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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