Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f8f5c5dfba929470b1d9c6874ae232d5c9c23dd94373b36eb5dd72b33b6b88d' 
  AND token = 'nxfUDGbtCnLMBotcwPt+H2IY1jbvxU2Nn7RKqA/8DMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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