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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02cc3a8ca5b40f3e42cc362c55ed433286a32508f3b0d6a8810688d056ae0d44' 
  AND token = 'IFYKgexakkXnyMAasemQfaDwXtAT35yjK+FQ1of4rBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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