Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc89b4b5212abffd6c8f1cc4d7038236fcd81ac48ca3f5fcb916a53a021e311' 
  AND token = 'O2kSdyIzjKvnbW3cxXa36jrrGzcwKRxVQpRdJvU9zgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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