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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7407112f38bdfb4559ca3af2f9fa3a3d829d61e83d9b88a29d1f71e19e27823c' 
  AND token = 'm+TxA9qTEwawdnvCzha4tq+WC+oVbLR7L5g169udl40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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