Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59c01b4e328be9c421f7a05a80c0e057e0145990b8c1689287bc1ceb46d65f62' 
  AND token = '2TVXTYdBsoBQWSHim5/xdlP8lqFmS1t8aaMxqZ0fWd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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