Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d63f7180678f61dae3bee6c68c38754f510faa0fa5ff3897e4910a838531b62' 
  AND token = 'x/uiir0X2kTZ5XYsD+yi96hxt6v1iGBdo4e3wImv+JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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