Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c368e9e007b19e91a59c5ba9512d26c6545b4b79657ae76d3da1021207dbc6' 
  AND token = 'lr+Nze90UH7TnbcqDWgk26KbpSfwQPa4tfvHUTYyOOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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