Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9c0c72c18f252f97728a5be0e64f042e3c9bc7bdb3e9bbb6d40bddc45ad84d' 
  AND token = '1mkFuqcM8pqHb5bNzvtY2EK/vOEDXt7hi5Sfnj8zFAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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