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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '977e91a82895c45e5d57bdc26559283a6f1a14d0ca7c4cbe53bce98ebcd581ca' 
  AND token = 'EVN7LBd/1JCs3+9SKkORs+uvT40qihzlGaalGHoIrXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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