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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ddb53e2482adbccd36ae457f09f980c1a8ed6203f9e63d7d173cc31cfcfa882' 
  AND token = 'sgRE3iV12IHaUHuKc9B7TAS6fVhtGmBoiBhWFKIxX4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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