Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ac3aedc0038b89a5e376617ee16eefe00f3fb5bf52042d86fdb2ea78eeee31' 
  AND token = 'Db1g/yk3ZwuoQUi8pwKgP1pfu4eaB89XsWSDv7+xDEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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