Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc2843c898ff96a7d1e167edffcf965dd84e492fbf79d25348bf7067e857a9c' 
  AND token = 'dsuAKHZtCf3fEPJgaFgQIVi4ZWCQCMbIy8kVTvcVoi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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