Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5294e31a819f6cbdcb3bd7863d52e0fb06377601ffa7565c9def98e8e23e09ca' 
  AND token = 'd3wT0KOt5BcrFCZOKp+azCZdb7WH9nJqiP9VTbgsy5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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