Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b1a649a46f9da263d1b50eac120a1ac61e0ce0aeb3f8eae41c55b8a16391ab' 
  AND token = 'fDRuCTYor3Tb/eyM4NtwJIY/l7TvyK3f4Iwm1GMTbIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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