Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0553ad0a86397ac8e6e17c8ce2fd6f8b58fe8b2c9d5ad5a9768f61c59739da69' 
  AND token = 'bUmmvPdvwn2qtTSeLrHG6sJ0VnBcjwhNcv1VNieLgCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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