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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02bd27b21311296b58e838d41cf46c3cac3e9dc01881efd788fd914181bdd806' 
  AND token = 'OGbfoLHztejea0EBDwVXuiViLEBck5EFQHJC1b4Dx24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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