Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e7491ab825642455c552e449ec65115b0a2d6e3f33d46741f28fa463c35e97' 
  AND token = 'cVUihUAUGky7dcUSJVJp78PCfHSkqmP3uTfR94B/WlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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