Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '70138d59907792332baf9f5c147bfb2b2ddb4cec5ae39c00f3426c3a6179cf2f' 
  AND token = '+GZdNaQD5ghz5uMOnZpPdXIYET2f5itOiay5ks91P+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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