Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b6563bcb88459fbd22da28b50f8250d365d2f6cd8dca056c46082e3f5b8968' 
  AND token = '6CDatxr72EDGpiQSrWeTbLAwo3JLDBJSuEtYxRcVGAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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