Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083a5e1b1244c8758bc10a044f59ab3548db0641a4f8da232afc0142adc8b47' 
  AND token = '28oRrQWFpEI6ldT9mYxh6fOJE62JupFpWL8MfvJHp3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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