Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4535e32f1f1af7b1a70a08cdd81e4c6192b6f431b8c914d41e3b8f53b4c84a6' 
  AND token = 's3AtQUV/7D1aujFVu9MsyMjN2R8lB3hAJ2lbKNngfvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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