Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf7ba17d8e0d3fc5c5b31b97260b93dcbe0283e6648fddfe7938da20aa66407' 
  AND token = 'iKvBZ9EfX2Wk3SjY4NX6rTdFnwod6JxSoruPEBXkq1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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