Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e92c8d35845b451023138755de0db00721c139d41aeeaf5ad31a5af21c8772' 
  AND token = 'h5qy9SstCld44QgnCuFaho0lQRGXW9bJHycg5N2huas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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