Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c2ed68ed0b7ec0a837263327766939768ba7d9aad6bcd4f55db9c43abc9b2a' 
  AND token = 'LLTLpIExDc6kqg/uDu4PiB6qpjICXh5LDsI+QaV9o58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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