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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f5dd737111afed484fc8f7754bfc71dbc353003c02f04121a90fe86992ec5775' 
  AND token = '0aMd9iAfKq86C+6G77AMySXaOZ67yoW5WKxgnet6zRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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