Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c34d82da2a60dc7054574267e162eb895f15ac5ef0bd0c3ff9b1a4ff539d340' 
  AND token = 'PmJkC7BCLlUj5/GmWol/b/HImnLHSdyirozGnC/GryU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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