Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8489c0fdde4abc108d73582dd1e1d085d40674a3f55b4e946d89f01f46dc4c52' 
  AND token = 'vq+0x77VWjt1Fe/cv9I/CQfRtk5gSqgDpkB/6OTbEh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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