Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e99f97a2aaeda19b78ae66bf3ecf959bf48735542982d0c4b866ada96ff5d76' 
  AND token = 'rUUH6qKRkw2lgxrRUW8vzfkSm6f2hGgen/qdIQtTZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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