Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f066aa44723ec60c8a5a4cd3099e380257c86c95a2eeea5d29d36e62e53ad085' 
  AND token = 'jvUTDAyPk2JFVmEQtQ0gtIHQikhlgxj7XBLiSWT5eTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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