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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1bb25a39386f3b5ab1fa7f0190b175959ca99cfb9d8d06f8c6c2ff50a18435e1' 
  AND token = '92Hs+f/iH0CGS6FIGWC8CUVC0xmAasQHqQ96RfOLHJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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