Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5099406f42c6a7fb2d6fc5276dbba431cc9df9961d6c2f16e8f6442ba56f5e' 
  AND token = '//hZvx62QwcLNWDiVZB305iZ8ffoNcnJNwSVBVk+2tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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