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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c044174dd897763d0b62df19c90aa091ff24e392602b1d3d7bb8ea5b6b91cfe5' 
  AND token = '72G3RUiUNOfkHm9BGLmWICsUAyCnOQIbyEYW+tPGejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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