Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c4a907f4369d597ab017022f4967a4f2d171c3ec4d0b0cadcbbc63682eb0e8' 
  AND token = 'u3vx6QQrSg6bZzR+fIY8BU4ouYG1FSeTiKdfAm34Gqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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