Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f285a1bea96edb4353daadf9721bf44d987c7dd4199e5ece9ced676f330b136' 
  AND token = 'jb3PTrldJdLh/fAFvfCP24bzCjIJh35K8mMkE1DTy/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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