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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71ebba1c8ee1082c773d4f9a4592d99b0be1d4f8fdee70b7e972b5471c8a208a' 
  AND token = '3hgco9xmqM6AswIEB+tCBt8u7BXVs0LNGNk52db8tpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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