Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4927e76c219bff62964953faf7f9165614e6fef1953e1331f43c095b9224d1a' 
  AND token = 'SIFhf3UI+KtHdMgJgYkf0czqepZCMdCjtREXOIIyNlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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