Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6102ef4bde53556eb71dc7ceb919057bc5d17b6903e813b2410c9359c0adb3ec' 
  AND token = 'G0n9ym3WqDpBCSphfVGHmMSQRKNFzzqPfs7VdmVaO+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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