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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b910fa67a7057d323ef56382ccfaf5b8dbf3ffb20115003f02bf10868da7eac' 
  AND token = 'C62m55BN+YlNkorIFAkh/wgTJLMxWXLa3en1nBwcwug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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