Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40eb145e008c76811dd10d47912ab5aef92af6d354a52f04414f537aab446a08' 
  AND token = 'JcljG3wKR+AMQoy1nDzEBIUfHJV5yA8kBZvHIdMaIAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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