Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e387f5c50783cc71a4cfd0ac3ca63b8363202e5944f23976dfc0a3215323f20f' 
  AND token = 'MFQ/YyeiaCDlAJSDk/e1JLevtAGMVcbtJbXQbqz1oNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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