Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f97168f2af0db6be90d41bd4e8f68d5ee4145729ba59b9d5e99424ed5f3f7f' 
  AND token = 'AduwA0oruF1XXam7/rMIKBmRptQJHeXCpPta+begwRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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