Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028eac849dde43742f1b8de830fadabd4dceedcc052d09ca0824fd092c2d8e4a' 
  AND token = 'MkhHmbEY5kbzyKc0728XsQG23ITwzylPwP6ajSukjxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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