Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb847dfa860838ff1119188f9cc120db7376342623d8e708f0daed8d773475ca' 
  AND token = 'DcciJCfa29jWNOJLpxR49hF/ICjEjAIgiyWdBsegbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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