Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2ec6949bdbd14c45fcddcd8bd6a941756ed0dfc15d8b012c0ea249e401659b' 
  AND token = '4qk5h+iXsPRTTvtHmsHt/aiLjQifKvy+QAlVG+y0rm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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