Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c925e4082211ddaa9b61e987ebbacb3244faf55629384d0704c0ca775206be69' 
  AND token = 'wDCeIi9vZeDlW4muCCZtmseiumORV+onF5fT/FzRH7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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