Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d93f63c7328f89de1e529da3b6964d24985c3e3276a5a771f3ae96d3ced584' 
  AND token = 'cjn/3PfqyZ50bpdS4djOqOoU1xHpWYgMA8e+Nec/NUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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