Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a9d4ad7cacb179b4a494395dee57875af74fa937da34fd9356a4647e04b0ba' 
  AND token = '+5MbZd6TIhsQf87f2UeRtEiQ+uJdRZKrw8V6GdaqT2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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