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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9c9e8841becf99c896b08e7804286adb03d7dfb48208de222e8de8aaded8b5d2' 
  AND token = 'fFetYIzzXWd7uPJE6V3DN4K+213pnZOBOyOc4t+EtO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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