Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810c78014088800992e160ffe38668d69cb6a2d5c3c9a506716a9647e8013be8' 
  AND token = 'fGEwrw/amK8jk8ECQY1M+4OSF46rwOXlNB3aphkaAOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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