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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e5ee17fcccaf25ae786326f696211f21563f7e4fcb6eb693b8c524e1c6a2af4' 
  AND token = 'vJXz0CobshNNlKcVv3pRxLjyvWJ12xgVeTt2cCJ2Nq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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