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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c08c8642a8e61a6897bdf568c8700b4f3831cd241fa92a12742a3d2a36e92e6e' 
  AND token = '9FtM/ja4LpJXj7Z3fuVWf2zo2WrBBUF0N2CZUlhEoaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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