Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b495a7a2e2d21f4b67e79eeeae111c2da8712f71d0cc74bb3503add869bb9fd' 
  AND token = 'NA4SrcUhorhgfNd8k6/0QfrppsYtcHhEKKqMDQ1k6ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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