Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f854da755962da4776a7ffd115349816a059e0a562ebecd503c755fdaacabe' 
  AND token = 'HUWCm6l1RXbKF1rHAAfItHJygfNPUQSadMNl8jTo1yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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