Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5b6cc3877b205f92db75a6e61bb11ac14ec745f6130a775eb74f3ca38ae7c1' 
  AND token = 'gJqTRRGizcDTAn6R8NvR5JMVyCmeEC9k53bNpVdUiak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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