Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97a2595761ec99542d65ca10ca9ee01f0ff04a06e21958f8682e1820e9ed830' 
  AND token = 'OlPSAxxsrUPM9P6gzVbrgrJPwG+sGEppIcEUCMqFN+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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