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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25c97938038ce03318b168873d2b9e6ae40c058a4335b6ee4003fcdd0365b479' 
  AND token = 'RszBCdujz0tg3NSUz18ncvI8PHXtbGazaaUwELhusd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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