Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7bde013423b645381f747a7f403fe7f95b715d14e4f8cb1adea55f5ae57356' 
  AND token = 'Mb3cksAmnpgl2mQXgquQZLuUnM+u8Cs3+kdK4/9ReE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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