Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d393ffec60b3fface5e6e459916ce60a52847037d627ea72ab580a33f315ad9' 
  AND token = '5rRpebicn/29c5Y24SzUXKrYgJ5jmgV85ioV4oCXTkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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