Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a256ed55918a6718bccc8bdf8f408473a2d0567f52aa49d8eb8bdd4b4a09a547' 
  AND token = 'Vtel1M/oVr56CQLR8MdaAvjAobPXkxQM1o71InB8JDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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