Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b681ceb5b04a4937697ebdc6b9051d52ac60d7dd03195cdcbe6bab40ecf77495' 
  AND token = 'G54WQ7wVVCuWfxEQmVlCsYc8pQZConU+apxocxU6vS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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