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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f66255a313333f32f83525393e7992e08533435c4b2d157424291d571026abf' 
  AND token = 'rokrk/jWMjURyobywKDQW4y3TinmyuNZhMcSsfMgCxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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