Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72bd46fa5d1041a9690d4556d8687d1295fd7f67642a3b82e09e09c2a272345' 
  AND token = '+sNuZw83RU4yR+ylNMHK7lQRM3N/QNFS7FRO/UmlobY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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