Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a36d97d95d53c40c7e7118e940f1a4430e5782e6f0893c9898e7e604ec7f90' 
  AND token = '4kKXnc2Cpc9R4FuTZRAb/D89jykHZtH5sJJf6TknZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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