Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c11dc2aefa0832d7a81a86dcf7b9c06986c49e6d260ddda896a6d1ec60ce7d' 
  AND token = 'RIiUtbgve/fPnIeh7IQaQVEgSmtObyiQkowx2VLzHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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