Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4b35fbf4b5883fd3560c1f2e7055cbfdcc782bd589d5a2c6ffe4d13c6e7a2e' 
  AND token = 'gUC9is+pRkMSuhlGeY0pTK9cD0/pog5hcD2inw7aZeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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