Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '181621e3fcdc8074946e73d827a901d166d9e458a14d2e0afe1ee23118000596' 
  AND token = 't3rElhfbL1cFVdhkB9IK9IvtMQHnB8WCHtnUJ827ZCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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