Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe9f29721141d9239ca20a5e0eb98878f17429621590f570effc10052ddb5e7' 
  AND token = 'lRYaU9Xf0jcf1tQh7XMToY1wxrDmMQKwe7u94MziSKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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