Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ca75fb055b46c32004ba4b6fa5f7197c5a4af19e0c81c08c722eb5a1a9759b' 
  AND token = 'HJBSInEH9grDQ3gjCR1J1ZpV+ClyO3HieZTXgIYgUj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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