Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ef1d14562d1b135c5829c661772659901b9ca4261f0a0ac5aa634f1f4a901c' 
  AND token = 'RUkiSbAsNevgPfQS1PYDjqgnCihaRgBtXE7PR5W5jT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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