Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f0056de4a05bd3df6048bf27e9301e8115c2ef1f8cc521dfcdac69931e9fe1' 
  AND token = 'W05hEFWy1q8UkrBe5w44OC4JhM1CJxF4EZF43PD5B+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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