Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c740f0ccdfc126e83d477dc689ed252745bebfd296140537d5c2dd9ea9528377' 
  AND token = 'Zci/yJcj7b8vm0Ira7SjzRJk8FING+FBPfXQFS5FJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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