Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3b175747323d39b62950da8328e769a0c151805a4a767a4a986b10bf4de3a4' 
  AND token = 'g20Z0aGgMYjBeblnClrS5q8NjaLUfRTNSw0Ud1G93dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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