Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b2493d8f9c281795ccd0d49a7bb4c332dca8e1b8763146be3a486aa8177899' 
  AND token = 'u/Xny/9JRCxd3fV6ZhkO62fVxUp07jzpj1t/tTvg098=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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