Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c12cbced05d58367959fb5f3760590db44e4902d9cb7f6dc72cb936fc15e7d' 
  AND token = 'nJHuGylm5yXVkPfHWBxGXNvt9o+TbjJriD5ri2E/e+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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