Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7661a331e3a2655f6292b3518a304d8fdd60e35025efeff8e0470a2b43c72cf' 
  AND token = 'zaraqFkPZ8mgUte9fcjGPKRSi7Klyh3S5fYI27iSAdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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