Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a6d963904addd6a527b3487291fdbebc8ee4da636fc796e33ae17bed61a1fe' 
  AND token = 'SGj5tMkNjzPPF0NfMTMyrBiVpfj0MqyTeObB0C2UeXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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