Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138ea2680fe8f0f63ff20a663b37dd63ed403e4a99224b47cf945d3afe37a969' 
  AND token = 'vaZR99FATC6iMudXEo+nSmdmHx5eraSlNMxjXZEzijI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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