Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaff84504fdb4da7eaa123df09a7c950ebbb888793c424d03a0386d3241ecf0a' 
  AND token = 'tiyoBxJBJtKO4Kg2VehCDPiFHWqqDXu2mKqX9Or5RJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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