Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb7413414c456b91a0e20812e165d8d8b2ffdcbf8c458faf2b2e7140e392976' 
  AND token = 'U8aVgfBBRXXB0fmDF7jHPK52yu4zkPwBdpiblJ8Ahd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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