Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2287ca6df1e8721d8639f4d43e43235f3dbad56f277a7644b6db1c894a323be3' 
  AND token = 'n9Mzil90I6NicRUwbAUGfUJUDBx4PTvAwIAlexjtidw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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