Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaabe1eb4dcc185c9206eb7f0f7bdab64cdd9b1719e476a9e6aded071249bbf' 
  AND token = 'BMJzOfeEgVNyfiMyIvX5NhUA7JhrKihQm18HJA/wWaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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