Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d21f7760204a0975f3965345541fedf993f1567711bd073d09417e03fb9e8b0' 
  AND token = 'qQkj1erEilQe55EjKkFtiWA4n2Vj5FW6YDeyty/sXGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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