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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '970c4be5f3f4fe7b201e7a542edcde2238d9577507e1b6f9b2cbde27a10ddd46' 
  AND token = 'gCnK/JbY527P+0L75yeaSRZTJ06JnOSXUC0OTyLZeng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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