Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8071d491a7bc124500f52cfdc87921140396f58549cf8918e091bd3dfb3a781c' 
  AND token = '2gPqN0leVXNg5WqOlcpCjnlMufeqD4nacuPkGm+vAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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